Is time real or is it an illusion?
Is time "real"?
Real as in that it has laws and such that are not merely relative. For example, morality is technically an illusion/concept created by man; there aren't any "laws" of morality, and it's not like as if morality is the 5th dimension or anything. If it weren't for humans, morality would not "exist".
So what about time? Is time just a concept describing...well...stuff happening? If so, then time travel would be impossible, since there would be no "time" as a dimension.